<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
      </el-row>
      <!-- 表格 -->
      <tree-table
      class="treetable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false">
        <!-- 是否有效isok -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted ===false"
            style="color: lightgreen;"
          ></i>
          <i class="el-icon-error" v-else style="color: red;"></i>
        </template>
        <!-- 排序order -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作opt -->
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <!-- 分类区 -->

      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
  title="添加分类"
  :visible.sync="addCateDialogVisible"
  width="50%"
  @close="addCateDialogClosed">
  <!-- 添加分类的表单 -->
  <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item label="分类名称：" prop="cat_name">
    <el-input v-model="addCateForm.cat_name"></el-input>
  </el-form-item>
  <el-form-item label="父级分类：">
    <el-cascader
    v-model="selectdKeys"
    :options="parentCateList"
    :props="cascaderProps"
    @change="paremtCateChanged"
    clearable
    change-on-select
    ></el-cascader>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表
      catelist: [],
      // 总数据条数
      total: 0,
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok"
        },
        {
          label: "排序",
          type: "template",
          template: "order"
        },
        {
          label: "操作",
          type: "template",
          template: "opt"
        }
      ],
      //控制对话框的显示与隐藏
      addCateDialogVisible: false,
      // 添加分类的表单数据对象
      addCateForm: {
        cat_name: '',
        // 父级分类id
        cat_pid: 0,
        // 分类的等级
        cat_level: 0
      },
      // 父级分类的列表
      addCateFormRules: {
        cat_name: [
           { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      },
      // 指定级联选择器的配置对象
      parentCateList: [],
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类的数组
      selectdKeys: []
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //   获取商品的分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.querInfo
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }
      //   把数据列表，赋值给catelist
      this.catelist = res.data.result;
      //    为总数据条数赋值
      this.total = res.data.total;
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum的改变
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog () {
      // 获取父级分类的数据列表
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
     const {data: res} = await this.$http.get('categories', { params: {type: 2} })
     if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败！");
      }
      this.parentCateList = res.data
      console.log(this.parentCateList)
    },
    // 选择项变化触发
    paremtCateChanged() {
      console.log(this.selectdKeys)
      // 如果selectkeys 数组中lenght大于0， 证明选中父级分类
      if (this.selectdKeys.length > 0) {
      this.addCateForm.cat_pid = this.selectdKeys[this.selectdKeys.length -1]
      this.addCateForm.cat_level = this.selectdKeys.length
      return
      }else {
         this.addCateForm.cat_pid = 0
         this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      //console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if(!valid) return
       const {data: res} =  await this.$http.post('categories',this.addCateForm)
       if (res.meta.status !== 201) {
        return this.$message.error("添加分类失败！");
      }
       this.$message.success("添加分类成功！");
       this.getCateList()
       this.addCateDialogVisible = false
      
      })
    },
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectdKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
};
</script>
<style lang="less" scoped>
.treetable{
  margin-top: 15px;
}
.el-cascader{
  width: 100%;
}
</style>